ShortCircuit Protection forThreePhase Power Inverters For more information call 3102527105 or visit us at wwwirfcom By Andrea Merello International Rectifier The light industrial and appliance ID: 253295
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THE POWER MANAGEMENT LEADER Short-Circuit Protection forThree-Phase Power Inverters For more information, call 310.252.7105 or visit us at www.irf.com By Andrea Merello, International Rectifier The light industrial and appliance markets are becoming more andmore demanding in terms of performance and safety features.These requirements are frequently at odds with the need for lowercosts due to the higher circuit complexity required. The IR2x381gate driver family is designed specifically to protect full invertersystems composed of a three-phase output bridge and brake,replacing at least seven traditional optocoupler gate drivers withone monolithic high voltage IC. Desaturation detection of thepower switch is fully integrated, increasing system reliability anddrastically reducing part count and layout space. Gate drivingdevice particularly well suited for motor drive applications. MONOLITHIC 1200V THREE-PHASE GATE DRIVING CAPABILITY With gate driving capability of 20V, the 350mA source-current and250mA max250mA max-voltage conditions inwhen an under-voltage occurs, the power switches that are undercompatible to ease communication with the system controller. Forof its collector. The collector voltage feedback is particularly key Figure 1: Typical application. MOTION CONTROL SHORT-CIRCUIT PROTECTION FOR THREE-PHASE POWER INVERTERS For more information, call 310.252.7105 or visit us at www.irf.com DESATURATION PROTECTION legs and for the brake driver. The IGBTan internal reference voltage of 8V. The same series resistor internally provided) or the BR pin forbrake.An internal network manages phase-to-phase short-circuits. Thegate drivers synchronize to freeze their state, becominginsensitive to input commands, until the short-circuit current isexhausted. This procedure is necessary to avoid an undesiredhard shutdown due to controller command during the softshutdown sequence. Hard shutdown follows after the softshutdown procedure has been accomplished. At this time, thefault pin becomes active. The fault clear pin is used to restore thenormal operation mode. light industrial and appliance designs up to 3.5kW, providing Figure 2: Phase-to-phase short circuit. phase-to-dc minusphase-to-dc minusCH1: FAULTCH2: phase voltageCH3: desaturated IGBT gate100A/div100A/div